Here’s a first: a real clock that tells time through actual knocks. Called the “Knock Clock”, this creation by Copenhagen Institute of Interaction Design students is set with knocks and tells time with a knocking sound. Click here to see the interior. Continue reading for a video.

…the clock tells you the time of day (to the quarter hour) after you knock on the top twice. Placing a hand over the sensor near the corner sets the alarm function. The alarm function also features – you guessed it – more knocking.

[via GizmodoMAKEFlickr]